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Note 13 - Subsequent Events (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
May 22, 2020
Mar. 31, 2020
Mar. 31, 2019
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property   $ 1,524 $ 143
Subsequent Event [Member]      
Gain (Loss) on Disposition of Property Plant Equipment, Excluding Oil and Gas Property and Timber Property $ 6,500